Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9aeb1def80b97dbe588aaa96105772905faf7b2d571f43d30f9bad107dad3c0' 
  AND token = 'Pp3z1kimTMtgOtIPPXlK/jdIUuUSk/owrgkeA2//c4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}